موضوعات
آموزش و پرورش
ادبیات و زبان
پزشکی، دندانپزشکی و داروسازی
تاریخ و جغرافیا
داستان و رمان
دیگر
دین و فلسفه
روانشناسی
ریاضیات و آمار
سلامتی، تناسب اندام و رژیم غذایی
شیمی و پلیمر
علوم اجتماعی و حقوق
علوم زیستی و بیوتکنولوژی
فیزیک و نجوم
کامپیوتر و اینترنت
کتابهای کودکان و داستان
کسب و کار و اقتصاد
کشاورزی و دامپزشکی و غذا
معماری
مهندسی و فناوری
هنر و تئاتر
محصولات
Adaptive Optics for Vision Science Principles Practices Design and Applications - Original PDF
نویسندگان: خلاصه: The high transverse resolution of retinal imaging systems equipped with adaptive optics provides a unique opportunity to record these eye move- ments with very high accuracy. Putnam et al. showed that it is possible to record the retinal location of a fixation target on discrete trials with an error at least 5 times smaller than the diameter of the smallest foveal cones [63]. We used this capability to measure the standard deviation of fixation positions FIGURE 1.7 Images of the cone mosaics of 10 subjects with normal color vision, obtained with the combined methods of adaptive optics imaging and retinal densi- tometry. The images are false colored so that blue, green, and red are used to repre- sent the S, M, and L cones, respectively. (The true colors of these cones are yellow, purple, and bluish-purple). The mosaics illustrate the enormous variability in L/M cone ratio. The L/M cone ratios are (A) 0.37, (B) 1.11, (C) 1.14, (D) 1.24, (E) 1.77, (F) 1.88, (G) 2.32, (H) 2.36, (I) 2.46, (J) 3.67, (K) 3.90, and (L) 16.54. The proportion of S cones is relatively constant across eyes, ranging from 3.9 to 6.6% of the total population. Images were taken either 1° or 1.25° from the foveal center. For two of the 10 subjects, two different retinal locations are shown. Panels (D) and (E) show images from nasal and temporal retinas, respectively, for one subject; (J) and (K) show images from nasal and temporal retinas for another subject. Images (C), (J), and (K) are from Roorda and Williams [52]. All other images were made by Heidi Hofer. (See insert for a color representation of this figure.) (From Williams and Hofer [57]. Reprinted with permission from The MIT Press.) across discrete fixation trials, obtaining values that ranged from 2.1 to 6.3 arcmin, with an average of 3.4 arcmin, in agreement with previous studies [63, 64]. Interestingly, the mean fixation location on the retina was displaced from the location of highest foveal cone density by an average of about 10 arcmin (as shown in Fig. 1.8), indicating that cone density alone does not drive the location on the retina selected for fixation. This method may have interesting future applications in studies that require the submicron registra- tion of stimuli with respect to the retina or delivering light to retinal features as small as single cells. Whereas the method developed by our group can only record eye position on discrete trials, Scott Stevenson and Austin Roorda have shown that it is possible to extract continuous eye movement records from video-rate images obtained with an adaptive optics scanning laser ophthalmoscope (AOSLO) [66]. Eye movements cause local warping of the image within single video frames as well as translation between frames. The warping and translation information in the images can be used to recover a record of the eye move- ments that is probably as accurate as any method yet devised. This is illus- trated in Figure 1.9, which compares the eye movement record from the AOSLO with that from a Dual Purkinje Eye Tracker. The noise in the AOSLO trace is on the order of a few arc seconds compared to about a minute of arc for the Dual Purkinje Eye Tracker. Note also the greatly reduced overshoot following a saccade in the AOSLO trace. These overshoots are thought to be partly artifacts caused by lens wobble following the saccade and do not reflect the true position of the retinal image. The AOSLO is not susceptible to this artifact because it tracks the retinal position directly rather than relying on reflections from the anterior optics.
Killing Hope_ US Military and CIA Interventions Since World War II. Part 1-Zed Books Ltd (2003) - Original PDF
نویسندگان: خلاصه: Introduction A Brief History of the Cold War and Anti-communism Our fear that communism might someday take over most of the world blinds us to the fact that anti- communism already has. —Michael Parenti1 It was in the early days of the fighting in Vietnam that a Vietcong officer said to his American prisoner: "You were our heroes after the War. We read American books and saw American films, and a common phrase in those days was "to be as rich and as wise as an American". What happened?"2 An American might have been asked something similar by a Guatemalan, an Indonesian or a Cuban during the ten years previous, or by a Uruguayan, a Chilean or a Greek in the decade subsequent. The remarkable international goodwill and credibility enjoyed by the United States at the close of the Second World War was dissipated country-by-country, intervention-by-intervention. The opportunity to build the war- ravaged world anew, to lay the foundations for peace, prosperity and justice, collapsed under the awful weight of anti-communism. The weight had been accumulating for some time; indeed, since Day One of the Russian Revolution. By the summer of 1918 some 13,000 American troops could be found in the newly-born Union of Soviet Socialist Republics. Two years and thousands of casualties later, the American troops left, having failed in their mission to "strangle at its birth" the Bolshevik state, as Winston Churchill put it.3 The young Churchill was Great Britain's Minister for War and Air during this period. Increasingly, it was he who directed the invasion of the Soviet Union by the Allies (Great Britain, the US, France, Japan and several other nations) on the side of the counter-revolutionary "White Army". Years later, Churchill the historian was to record his views of this singular affair for posterity: Were they [the Allies] at war with Soviet Russia? Certainly not; but they shot Soviet Russians at sight. They stood as invaders on Russian soil. They armed the enemies of the Soviet Government. They blockaded its ports, and sunk its battleships. They earnestly desired and schemed its downfall. But war—shocking! Interference—shame! It was, they repeated, a matter of indifference to them how Russians settled their own internal affairs. They were impartial—Bang!4 What was there about this Bolshevik Revolution that so alarmed the most powerful nations in the world? What drove them to invade a land whose soldiers had recently fought alongside them for over three years and suffered more casualties than any other country on either side of the World War? The Bolsheviks had had the audacity to make a separate peace with Germany in order to take leave of a war they regarded as imperialist and not in any way their war, and to try and rebuild a terribly weary and devastated Russia. But the Bolsheviks had displayed the far greater audacity of overthrowing a capitalist- feudal system and proclaiming the first socialist state in the history of the world. This was uppityness writ incredibly large. This was the crime the Allies had to punish, the virus which had to be eradicated lest it spread to their own people. 6 The invasion did not achieve its immediate purpose, but its consequences were nonetheless profound and persist to the present day. Professor D.F. Fleming, the Vanderbilt University historian of the Cold War, has noted: For the American people the cosmic tragedy of the interventions in Russia does not exist, or it was an unimportant incident long forgotten. But for the Soviet peoples and their leaders the period was a time of endless killing, of looting and rapine, of plague and famine, of measureless suffering for scores of millions— an experience burned into the very soul of a nation, not to be forgotten for many generations, if ever. Also for many years the harsh Soviet regimentations could all be justified by fear that the capitalist powers would be back to finish the job. It is not strange that in his address in New York, September 17, 1959, Premier Khrushchev should remind us of the interventions, "the time you sent your troops to quell the revolution", as he put it.5 In what could be taken as a portent of superpower insensitivity, a 1920 Pentagon report on the intervention reads: "This expedition affords one of the finest examples in history of honorable, unselfish dealings ... under very difficult circumstances to be helpful to a people struggling to achieve a new liberty."6 History does not tell us what a Soviet Union, allowed to develop in a "normal" way of its own choosing, would look like today. We do know, however, the nature of a Soviet Union attacked in its cradle, raised alone in an extremely hostile world, and, when it managed to survive to adulthood, overrun by the Nazi war machine with the blessings of the Western powers. The resulting insecurities and fears have inevitably led to deformities of character not unlike that found in an individual raised in a similar life- threatening manner. We in the West are never allowed to forget the political shortcomings (real and bogus) of the Soviet Union; at the same time we are never reminded of the history which lies behind it. The anti-communist propaganda campaign began even earlier than the military intervention. Before the year 1918 was over, expressions in the vein of "Red Peril", "the Bolshevik assault on civilization", and "menace to world by Reds is seen" had become commonplace in the pages of the New York Times. During February and March 1919, a US Senate Judiciary Subcommittee held heatings before which many "Bolshevik horror stories" were presented. The character of some of the testimony can be gauged by the headline in the usually sedate Times of 12 February 1919: DESCRIBE HORRORS UNDER RED RULE. R.E. SIMONS AND W.W. WELSH TELL SENATORS OF BRUTALITIES OF BOLSHEV1KI— STRIP WOMEN IN STREETS—PEOPLE OF EVERY CLASS EXCEPT THE SCUM SUBJECTED TO VIOLENCE BY MOBS
Digital Signal Processing: A Student Guide - Original PDF
نویسندگان: خلاصه: Digital Signal Processing (DSP) is concerned with the use of programmable digital hardware and software (digital systems) to perform mathematical operations on a sequence of discrete numbers (a digital signal). Such processing is needed to facilitate the extraction of information embedded in the signal.
168hours : you have more time than y ou think - PDF
نویسندگان: خلاصه: Keep track of your time, hour by hour, for a week or two so you can see how you’re actually spending your time. One woman called it “one mortifying experience” when she realized how much time she was actually spending checking Facebook while at work and how often it derailed her from getting actual things done. Figure out what your core competencies are and spend your time doing those. What are you best at? Writing? Cooking? Nurturing relationships with our significant others and children (hopefully no one is better at that than you are . . . ). Maximize your time doing those things and minimize how much time you spend doing other things. Stop doing pretend work. Lots of us spend a lot of time being busy but doing things that aren’t actually that valuable. Are you spending a lot of time doing meaningless housework, or setting up elaborate organizational systems or having long conference calls that could be finished in ten minutes if you got right on task? Whether this is in your home life or your work life, you could probably get the “have to” things done a lot faster and more efficiently than you do. I basically always spend the entire two hours of nap and quiet time at my desk, but I often end up wasting so much time trying to multi-task between screens, doing fairly unimportant busy work (spending the last $15 on a gift card or trying to clear my inbox) that I end up having to work in the evenings too and then I feel like I spend all my time “working.” Since I finished this book, I’ve made a list each day of what I needed to get done and then I just put my head down and work, not getting distracted by the other maybe-should be things that don’t matter nearly so much or could get done later at a less focused time. Decide what you can off-load. She’s an enormous fan of outsourcing as much as possible, whether it’s laundry, grocery shopping, house cleaning, lawn care, etc. She argues that Pick 2-4 hobbies or activities you want in your life. You may be saying you want to sew more or read more books or volunteer with an organization you care about or run a marathon, but then you end up squandering your free time doing really low-investment things like watching TV (which is draining and not nearly as fun as you think it is). Figure out what you want to do and then when you can fit them in and make the happen. You’ll be rejuvenated by doing the things you’ve always meant to do and the lure of the Internet and TV will be reduced. She also says one of your hobbies really should/must be exercise. When you consider doing 30 minutes, 5 days a week, that’s only 3 hours out of your entire 168 a week. You can probably (almost certainly) fit it in. I love that she doesn’t argue that it’s easy to make it happen. It takes a lot of planning and discipline to make your life look like you want it to, instead of just piddling your life away running errands, checking email, and watching TV. And she has such an engaging writing style – I think she’s somewhat similar to Gretchen Rubin, with a lot of anecdotes, discussions about what she does well herself and also where she falls short, and an ability to make all sorts of data and statistics really engaging. There are certainly things I don’t agree with her on. I’m not willing to let my housekeeping slip to barely passable to get back a small chunk of time; I’m not the world’s best housekeeper by any means and the time I spend cleaning is fairly minimal, but I don’t keep things tidy because I care what other people think – I keep the clutter to a minimum because it makes ME crazy when there are piles of things on every surface. And she doesn’t seem to enjoy cooking like I do – yes, I could probably reduce the time I spend cooking by making easier meals or doing grocery delivery, but I’m not looking to outsource those things and I like to cook. And having been in schools, I totally disagree with her hypothesis that school lunches are way improved from days of old and that it’s well-worth having your kids just buy a lunch for a few bucks (also, having just read Slim by Design, I know that people who pack their lunches tend to eat more healthily than those who buy because you pack your lunch when you’re usually not terribly hungry (after dinner or breakfast) and so you make fairly good choices, whereas if you buy lunch when you’re starving, guess what you buy? Not salad).
Group Psychotherapy with Addicted Populations - Original PDF
نویسندگان: خلاصه: ABSTRACT Be more effective in group therapy with addicted clients Group Psychotherapy with Addicted Populations: An Integration of Twelve-Step and Psychodynamic Theory, Third Edition is the newly revised edition of the classic text, that provides you with proven strategies for defeating alcohol and drug addiction through group psychotherapy. Philip J. Flores, a highly regarded expert in the treatment of alcoholism and in group psychotherapy brings together practical applications of 12-step programs and psychodynamic groups. This updated book explores the latest in constructive benefits of group therapy to chemically dependent individuals, providing opportunities to share and identify with others who are going through similar problems, to understand their own attitudes about addiction by confronting similar attitudes in others, and to learn to communicate their needs and feelings more directly. Topics in Group Psychotherapy with Addicted Populations: An Integration of Twelve-Step and Psychodynamic Theory, Third Edition include: alcoholism, addiction, and psychodynamic theories of addiction alcoholics anonymous and group psychotherapy use of confrontational techniques in the group inpatient group psychotherapy characteristics of the leader transference in the group resistance in groups preparing the chemically dependent person for group the curative process in group therapy integrating a modern analytic approach a discussion of object relations theory group psychotherapy, AA, and twelve-step programs diagnosis and addiction treatment treatment issues at early, middle, and late stages of treatment a discussion of guidelines and priorities for group leaders countertransference special considerations of resistance to addiction termination of treatment Professionals working in group therapy and addictions will find Group Psychotherapy with Addicted Populations: An Integration of Twelve-Step and Psychodynamic Theory, Third Edition an invaluable resource emphasizing the positive and constructive opportunities group psychotherapy brings to the chemically dependent individual.آیا کتاب مورد نظر هنوز بر روی سایت قرار نگرفته است؟ جای نگرانی نیست! کافی است بر روی گزینه سفارش کتاب کلیک کرده و درخواست خود را ثبت کنید. در کمتر از چند ساعت کتاب شما را آماده خواهیم کرد.